[ApiModel] Also register holder for types when stubbing

Change-Id: Iac0ec62547c7657f0e43867b9f352347e7ff7ad9
diff --git a/src/main/java/com/android/tools/r8/androidapi/ApiReferenceStubber.java b/src/main/java/com/android/tools/r8/androidapi/ApiReferenceStubber.java
index f8ed446..b6edd92 100644
--- a/src/main/java/com/android/tools/r8/androidapi/ApiReferenceStubber.java
+++ b/src/main/java/com/android/tools/r8/androidapi/ApiReferenceStubber.java
@@ -78,22 +78,22 @@
 
     @Override
     public void registerInstanceFieldRead(DexField field) {
-      checkReferenceToLibraryClass(field.type);
+      checkReferenceToLibraryClass(field);
     }
 
     @Override
     public void registerInstanceFieldWrite(DexField field) {
-      checkReferenceToLibraryClass(field.type);
+      checkReferenceToLibraryClass(field);
     }
 
     @Override
     public void registerStaticFieldRead(DexField field) {
-      checkReferenceToLibraryClass(field.type);
+      checkReferenceToLibraryClass(field);
     }
 
     @Override
     public void registerStaticFieldWrite(DexField field) {
-      checkReferenceToLibraryClass(field.type);
+      checkReferenceToLibraryClass(field);
     }
 
     @Override